{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-3929 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-3929 is a high-severity use after free vulnerability in Fedoraproject Fedora, published on 25 Aug 2022. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-3929 and fix it if it is affected.\n\nWhat it is: CVE-2021-3929 is a high-severity use after free vulnerability in Fedoraproject Fedora, published on 25 Aug 2022. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-3929 in the wild and no public exploit code.\n\nAffected product: Fedoraproject Fedora. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-3929/ (Markdown: https://insights.sbomify.com/CVE-2021-3929/index.md)","id":"CVE-2021-3929","markdown":"https://insights.sbomify.com/CVE-2021-3929/index.md","name":"CVE-2021-3929","record":{"aliases":["AZL-10721","AZL-35152","DEBIAN-CVE-2021-3929","GHSA-h66w-323g-4q62","OESA-2022-1733","UBUNTU-CVE-2021-3929","openSUSE-SU-2024:11969-1"],"analysis":{"component_type":"operating_system","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"QEMU NVMe emulation","requires_auth":"high_privilege","summary":"A malicious guest can trigger a use-after-free in QEMU's NVMe emulation to crash the host or execute arbitrary code.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"fedora","vendor":"fedoraproject"},{"product":"qemu","vendor":"qemu"}],"cvss":{"score":8.2,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"A DMA reentrancy issue was found in the NVM Express Controller (NVME) emulation in QEMU. This CVE is similar to CVE-2021-3750 and, just like it, when the reentrancy write triggers the reset function nvme_ctrl_reset(), data structs will be freed leading to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition or, potentially, executing arbitrary code within the context of the QEMU process on the host.","ecosystems":["openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":"2022-05-13","github_poc":2,"max_poc_stars":171,"metasploit":0,"nuclei":0,"refs":[{"date":"2022-05-13T05:33:28Z","kind":"github_poc","ref":"https://github.com/QiuhaoLi/CVE-2021-3929-3947","stars":171,"title":"Recursive MMIO VM Escape PoC"},{"date":"2026-10-17T00:12:13Z","kind":"github_poc","ref":"https://github.com/abraxas/qemu-nvme-sgl-bar","stars":0,"title":"QEMU 11.1.2 - High - Local - UAF - NVMe SGL span into BAR0 incomplete CVE-2021-3929"}],"tier":"poc_unverified"},"has_fix":true,"headline":"Use after free in QEMU","id":"CVE-2021-3929","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"fedoraproject:fedora","products":["fedoraproject:fedora","qemu:qemu"],"type":"use_after_free","year":"2021"},"n_packages":1,"n_references":6,"next":{"headline":"Denial of service in QEMU","id":"CVE-2021-3930"},"packages":[{"ecosystem":"openSUSE:Tumbleweed","fixed":["6.2.0-44.1"],"introduced":["0"],"last_affected":[],"package":"qemu","purl":"pkg:rpm/opensuse/qemu\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2024:11969-1"}],"prev":{"headline":"Use of Uninitialized Variable in vim/vim","id":"CVE-2021-3928"},"products":["QEMU"],"published":"2022-08-25","related":[{"cvss_score":9.8,"headline":"PHP-CGI OS Command Injection","id":"CVE-2024-4577","kev_date_added":"2024-06-12","published":"2024-06-09"},{"cvss_score":9.8,"headline":"Grafana Authentication Bypass","id":"CVE-2021-39226","kev_date_added":"2022-08-25","published":"2021-10-05"},{"cvss_score":9.8,"headline":"VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow","id":"CVE-2019-5544","kev_date_added":"2021-11-03","published":"2019-12-06"},{"cvss_score":9.6,"headline":"Google Chromium V8 Type Confusion","id":"CVE-2024-4947","kev_date_added":"2024-05-20","published":"2024-05-15"},{"cvss_score":9.6,"headline":"Google Chromium Visuals Use-After-Free","id":"CVE-2024-4671","kev_date_added":"2024-05-13","published":"2024-05-09"},{"cvss_score":9.6,"headline":"Google Chromium Mojo Insufficient Data Validation","id":"CVE-2022-3075","kev_date_added":"2022-09-08","published":"2022-09-26"},{"cvss_score":9.6,"headline":"Google Chromium Indexed DB API Use-After-Free","id":"CVE-2021-30633","kev_date_added":"2021-11-03","published":"2021-10-08"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2025-02-28","vendors":["n/a"]},"summary":"A malicious guest can trigger a use-after-free in QEMU's NVMe emulation to crash the host or execute arbitrary code.","url":"https://insights.sbomify.com/CVE-2021-3929/"}